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Now <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> pP .c <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS, RDI <br /> • Kasey Foley,REHS <br /> • 6q.,�—,. �P Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> �tFOR`' Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> May 3, 2012 <br /> Mr. Charles Skobrak <br /> 9947 East Highway 26 <br /> Stockton, California 95215 <br /> Subject: Larry's Auto <br /> 308 North Grant Street <br /> Stockton, California 95202 <br /> Dear Mr. Skobrak: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> In-situ Air Sparging Work Plan (Work Plan), dated 06 April 2012, and Semi-annual Report— <br /> First Quarter 2012 (Report), dated 09 April 2012, prepared and submitted by your consulting <br /> firm, Advanced GeoEnvironmental, Inc. (AGE), on your behalf for the above-referenced site. <br /> In the Report, AGE presented groundwater monitoring data and analytical results for <br /> groundwater samples collected on 28 February 2012, data collected from operating the soil <br /> vapor extraction (SVE) system, and reported on efforts to perform in-well air sparging using <br /> two different techniques during the fourth quarter 2011 and first quarter 2012. In the Work <br /> Plan, AGE proposed installing an in-situ air sparging (IAS) system to inject air into soil vapor <br /> extraction wells VW-5C, screened between 45 and 55 feet below surface grade (bsg) and <br /> VW-2B, screened between 44 and 54 feet bsg, and modifying the SVE system to <br /> accommodate the proposed IAS system. <br /> By letter dated 16 April 2010, the EHD had directed that a work plan be submitted for the <br /> collection of soil gas samples in the area of MW-5 where high concentrations of benzene and <br /> total petroleum hydrocarbons (TPH) as gasoline had been detected in groundwater samples. <br /> By letter dated 02 July 2010, the EHD had extended the date for submitting the soil gas <br /> sampling work plan from 01 June 2010 to 30 July 2010; and by letter dated 11 October 2010, <br /> the EHD had directed that the referenced work plan be submitted within thirty days of the date <br /> of that letter. In that same letter, the EHD had approved Remedial Action Work Plan — In-well <br /> Air Sparging, dated 02 September 2010, and had stated that if the initial results from the <br /> IAS/SVE system were favorable, then proceed to submit a work plan to install additional <br /> extraction wells with in-well air-sparging points in the southeast area of this site near <br /> monitoring wells MW-4, MW-5 and MW-8. <br /> By email dated 29 October 2010, AGE responded to the EHD directive to submit a work plan <br /> to collect soil gas samples. Instead of submitting a work plan, however, AGE presented <br /> reasons why "soil vapor sampling within shallow soil is not warranted at the site." The EHD <br />